Detect circles in an image

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Sonal Singh
Sonal Singh il 15 Mag 2021
Modificato: Matt J il 15 Mag 2021
I am trying to detect circles on the image. An example of image is given here. I used imfindcircles but it doesn't detect any circles, this is the output on screen. Could someone help me or let me know what's wrong please?

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Matt J
Matt J il 15 Mag 2021
Modificato: Matt J il 15 Mag 2021
Use ObjectPolarity='dark'.

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